Someone said:
>> Of course, such number-based addressing is somewhat dangerous to use in a
>> static URL,
And Adrian Colley replied:
> Well, you could protect it with if-modified-since. If you want a link
> which will get the index to any .zip file on a remote machine even after it
> changes, then you have to decide where to put the zip-interpreting code.
Actually, you'd have to protect it with an if-not-modified-since. That
is, you don't really want the piece you've identified if the whole
thing has been changed.